4-6
FS-1900
Charging the drum
The following shows a simplified diagram of the electrophotographic components in relation to the
engine system. Charging the drum A is done by the main charger wire B.
Figure 4-1-4 Charging the drum
As the drum A rotates in a “clean (neutral)” state, its photoconductive layer is given a uniform,
positive (+) corona charge dispersed by the main charger wire B. The grid C regulates the main
charging potential so that it is evenly and stably dispersed over the drum A at a constant voltage
level.
Due to being high-voltage scorotron charging, the main charger wire B can get contaminated by
oxidization after a long run. Therefore, it must be cleaned periodically from time to time using the
method explained in chapter 3, page 3-9. Cleaning the main charger wire B prevents print quality
problems such as black streaks.
MCHON*
Main charging
output
Engine board
YC204-10
B
A
C
High voltage unit
Zener
board
KP-768
M
CN2-9
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